For stand alone (one user) models, when a model is first created and the number of backups is defined Revit alters the backup naming as you save. For example, if your file is configured for 5 backup files, the first save produces a backup of MyProject.0001.rvt. The second MyProject.0002.rvt. The third MyProject.0003.rvt, The fourth MyProject.0004.rvt and the fifth MyProject.0005.rvt. Once Revit hits the maximum number of backup files it starts to overwrite the oldest backup, MyProject.0001.rvt is replaced with MyProject.0006.rvt. So it continues so your 226 indicates you've saved 226 times. You ought to see however many other backup files were specified, such as .0225, .0224, .0223 etc...
If you typically save once an hour it could be argued that a file should have at least 8 backup files specified so a discreet backup is created for each save. If you save more often then the number of backups could be set to however many you might wish to revert back to. If you save every 10 minutes and have three backup files specified the furthest back you could recover a version is 30 minutes ago.
Steve Stafford
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