File Storage

LSAIT works with you to match your file storage needs with the various on- and off-campus solutions provided, including:

There is a comparison chart at the bottom of the page to help you decide which of these services is right for you. If you are or will be storing any sensitive data, including but not limited to credit card or payment card industry (PCI) information, export-controlled research, private personal information (PPI), protected health information (PHI), or social security numbers, please refer to the Sensitive Data Guide for guidance as to what types of sensitive data can be stored on these services. If you're still not sure which of these services is right for you, please contact the LSAIT Service Desk or your regional support team for assistance.

Only the home and group directories and the research storage services are administered directly through LSAIT; for all of the other services, we just coordinate and liase with ITS. Please refer to the ITS Storage Services portal page for additional information on their services.


FileSender is a web-based service provided by Internet2 that's free to Internet2 members, including U-M, that allows authenticated users to securely and easily send arbitrarily large files to other users. Once logged in using your uniqname and password, you can upload files (up to 9.77 TB each) for up to 14 days. The upload and download are secured using HTTPS, but if your file contains confidential information, it should be encrypted before uploading. FileSender is intended to send a large file to someone, have that file available for download for a certain number of downloads, a certain amount of time, or both and after that automatically delete the file. The software is not intended as a permanent file publishing platform.

If you need to receive a file from someone who does not have a uniqname or guest account, you can provide them an upload voucher.

LSAIT does not support FileSender but we make this information available in case it's of use.

Comparison ChartCompare the file storage services to help decide which is right for your needs.

This chart compares the various LSA-offered file storage services to each other to help you decide which is right for you.

Feature Service
AFS FileSender H: & S: M+Box M+Google Mainstream
Size 9.77 TB max 10 GB chunks 50 GB max 30 GB max
incl. email storage
10 GB chunks 2 TB to start,
1 TB chunks
1 TB chunks
Sensitive Data No N/A 0 Most Some Some Most Maybe ¹ No
On Flux No N/A No No No Yes Yes Yes
On Linux Yes Yes Yes No Yes Yes Yes Yes
On MacOS Yes (with BlueDisc) Yes Yes Yes Yes Yes Yes Yes
On Windows Yes (with BlueDisc) Yes Yes Yes Yes Yes Yes Yes
Snapshots Daily No Yes ² No Change-by-change Yes ² No ³ No ³
Web Access Yes Yes Yes Yes Yes Yes Yes Yes
Security Detailed ACLs for users and groups Only available to people you give the URL Standard Windows (CIFS) Role-based access controls; password- and time-based sharing Broad ACLS for users and groups Standard Windows (CIFS) Standard Unix (NFS) or Windows (CIFS) Standard Unix (NFS) or Windows (CIFS)
Typical Use Case Personal or group files that don't need to be shared, or which need to be shared with other AFS institutions Transferring very large files to individuals, stored for 2 weeks or less Home (H:) for personal files; Group (S:) for unit-shared files Personal or group files, shared within and outside U-M Personal or group files, shared within and outside U-M Personal or group files Research files, shared among a U-M project team Personal or group files
0   IIA has not defined what sensitive data can be stored on FileSender. If you encrypt the data before sending it may be allowed; if you don't it may not. Contact the ITS Service Center for assistance.
¹   Research Storage can store sensitive data if and only if it uses Mainstream Storage. not Value Storage, underneath it. Refer to the Mainstream Storage and Value Storage sections for more information.
²   Mainstream Storage takes snapshots daily at 12pm and 4pm, retained for 3 days; nightly at 12am, retained for 7 days; and weekly Sundays at 12am, retained for 8 weeks. You can perform restores yourself by going into the appropriate snapshot and copying your file(s) back out.
³   Value Storage does perform nightly replication to a second data center for disaster recovery purposes, but there is no self-service file restores from snapshots. If you want your Research Storage or Value Storage backed up, see our Backup services page.

For more information, please see ITS' Storage Solutions Summary Chart. While that chart doesn't list the LSA-specific Home and Group Directories (H: and S:) service, it uses Mainstream Storage.