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Managing user accounts and company files > Backing up and restoring company files
Backing up is the copying of a company file to some form of storage medium, such as a CD, a different hard disk or other media. You can also use the backup function to create a compressed archive file with a .ZIP extension that takes up less space.
The Restore command closes the company file you’re currently using, decompresses a backup file so you can use it and then opens the backup file.
Making a backup file requires single-user access. For more information, see Single-user file locking for special tasks.
Avoid common mistakes that can cause you to lose backups of company files:
Take care when backing up multi-user company files 
If multiple users access a company file on a host computer, back up the host company file—especially if you include custom forms, and letter and spreadsheet templates, in the backup.
By making a full backup, you ensure that the most recent versions of custom forms and templates are backed up.
Don’t store backups on the same hard disk as the software  A single disaster can wipe out all your records.
Make separate backups  A disk failure can corrupt your data in such a way that you may not notice it during a session. If you accidentally copy some corrupted data over your previous backup file, that backup is no longer valid. Without a valid backup, you would need to re‑create your company file. You can reduce the risk by making separate backups to protect your company data—for example, at the end of each business day.
Store backups off-site Store monthly and yearly backups in a safe place, preferably away from your office. Except for daily rotational backup, do not re-use media.

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