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How do you check if the specified disks or mount points have enough space for database backup.

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    If you're not using compression, the backup will be a similar size to that of your database (it might be a little larger, or smaller, depending on the active transactions). If you're using compression, it'll be smaller, but how much smaller is very hard to calculate; as that totally depends on your database. The "easiest" way is to actually perform a backup. Commented Dec 8, 2018 at 13:46
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    See this answer for estimating non-compressed backup size. xp_fixeddrives will report available free space. Commented Dec 8, 2018 at 13:48

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