How do I back up my Sage 50 company file before converting to QuickBooks?
Back it up with Sage 50's own backup command, with every user logged out, then verify the backup and keep the original company untouched during the conversion.
Back it up with the backup command built into Sage 50, not by copying files by hand while the program is open. Get every user out of the company first, confirm the finished backup looks complete, and store a copy away from the machine holding the live data. Then leave the original company untouched and let the conversion work from a copy.
Back up from inside Sage 50
Sage 50 ships with its own backup routine, and that is the right tool. It writes a backup the program itself can restore, which matters if a conversion ever has to be repeated. Have all users close the company before you start; a backup taken while others are working can miss recent entries. Menu wording differs between editions and releases, so follow the backup option in your own copy. If your edition keeps the company as a folder of several files rather than one file, copy the entire folder as well.
Pick a cutoff date, post the final entries in Sage, then take the backup. Anything entered after that point will be missing from the conversion unless the work is repeated, so plan the timing with whoever runs it.
How do you know the backup is any good?
Check the obvious first: the backup file exists, its timestamp is today, and its size is plausible next to the live data. A backup far smaller than expected usually means it stopped partway. The strongest test is a restore into a temporary location, which proves the file can rebuild the company. If the restore refuses to run, take a fresh backup before anything else touches the data.
Where should the backup live?
Keep at least two copies in two places. One can stay on the office server or an external drive; the other should leave that machine entirely, on a USB drive stored elsewhere or an encrypted cloud folder. The goal is simple: if the drive holding the live company fails, the backup must not fail with it.
Keep the original untouched
A conversion reads the Sage data and builds a new QuickBooks company, so it has no reason to alter the Sage file. Treat the original as read-only anyway. Do not condense, clean up, or restructure the Sage company to make it convert better; those steps can shift balances mid-project. Our engineers run the Sage 50 to QuickBooks conversion from the copy you send, and your live company stays closed throughout.
Next step: choose the cutoff date, run the backup after the final entries are posted, and confirm it restores. When it checks out, send us the copy for a free evaluation and a quote, and keep the original exactly as it was.