Verifying file system snapshots

A computer program product comprising:

• one or more computer readable storage media and program instructions stored on the one or more computer readable storage media, the program instructions comprising instructions to:
• receive a snapshot comprising one or more files;
• calculate one or more file checksums for the files in the snapshot;
• create a listing of elements in the snapshot;
• calculate a listing checksum corresponding to the listing of elements in the snapshot;
• compare the one or more file checksums and the listing checksum of the received snapshot to one or more file checksums and listing checksums of an unverified snapshot responsive to receiving a snapshot verification request;
• and
• provide an indication that the snapshot is valid responsive to determining that the one or more file checksums and the listing checksum of the received snapshot and the one or more file checksums and listing checksums of an unverified snapshot are the same.

A computer system comprising:

• one or more computer processors;
• one or more computer-readable storage media;
• program instructions stored on the computer-readable storage media for execution by at least one of the one or more processors, the program instructions comprising instructions to:
• receive a snapshot comprising one or more files;
• calculate one or more file checksums for the files in the snapshot;
• create a listing of elements in the snapshot;
• calculate a listing checksum corresponding to the listing of elements in the snapshot;
• compare the one or more file checksums and the listing checksum of the received snapshot to one or more file checksums and listing checksums of an unverified snapshot responsive to receiving a snapshot verification request;
• and
• provide an indication that the snapshot is valid responsive to determining that the one or more file checksums and the listing checksum of the received snapshot and the one or more file checksums and listing checksums of an unverified snapshot are the same.