Maintaining files in a retained file system

A non-transitory computer readable medium storing instructions executable by a processing resource, the non-transitory computer readable medium comprising:

• instructions to store data at a file system;
• instructions to store a backup copy of the data at a storage system;
• instructions to, while the data is being stored at the file system, compute a validation checksum on entire content of the data and store the validation checksum;
• and
• instructions to perform an integrity check comprising:
• instructions to compute a run-time checksum on entire content of the data stored at the file system,
• instructions to perform a comparison between the run-time checksum and the validation checksum, and
• instructions to restore the data from the backup copy if the comparison indicates that the run-time checksum does not match the validation checksum.

A method comprising:

• storing data at a file system;
• storing a backup copy of the data at a storage system;
• while the data is being stored at the file system, computing a validation checksum on entire content of the data and storing the validation checksum;
• and
• during an integrity check:
• computing a run-time checksum on entire content of the data stored at the file system,
• performing a comparison between the run-time checksum and the validation checksum, and
• restoring the data from the backup copy when the comparison indicates that the run-time checksum does not match the validation checksum.

A system comprising:

• a processing resource;
• and
• a non-transitory computer readable medium storing instructions that, when executed, cause the processing resource to:
• store data at a file system,
• store a backup copy of the data at a storage system,
• compute a validation checksum on entire content of the data while the data is being stored at the file system and store the validation checksum,
• perform an integrity check by computing a run-time checksum on entire content of the data stored at the file system and comparing the run-time checksum and the validation checksum, and
• restore the data from the backup copy if comparing indicates that the run-time checksum does not match the validation checksum.