Which file system attribute indicates that the file has been modified at some point since the last backup operation?

The A (Archive Needed) attribute in NetWare is automatically set by the file system whenever a file is created or modified, indicating the file has changed since its last backup. Backup software reads this attribute to identify files that require backing up and clears the attribute after a successful backup completes. This mechanism enables incremental and differential backup strategies to efficiently target only those files changed since the last backup run.

The H (Hidden) attribute hides a file from directory listings and has no relationship to backup status tracking.

The P (Purge) attribute causes immediate permanent deletion when the file is removed and does not indicate backup status.

The Ci (Copy Inhibit) attribute restricts copying of the file by non-supervisor users and has no bearing on whether the file needs to be backed up.

The Dc (Don't Compress) attribute prevents the compression subsystem from compressing the file and does not track modification status for backups.

The Di (Delete Inhibit) attribute prevents deletion of the file and does not indicate whether the file has been modified since the last backup.

The Dm (Don't Migrate) attribute prevents the file from being migrated to secondary storage and does not serve as a backup status indicator.

The Ds (Don't Suballocate) attribute prevents the file from using block suballocation for storage efficiency and does not track backup-relevant modification status.

The Ic (Immediate Compress) attribute triggers immediate compression on modification and does not function as a backup status indicator.

The Ro (Read Only) attribute prevents modifications to the file but does not track whether the file has been modified since the last backup.