Autosave is like every 30 minutes, and I do not really use it. I save when I change something that warrants the project (in separate folders) be saved. (I think "autoave" is only one file, and the file is the project file that saves how the project is, not every audio file or picture file as they are called - just the small file that saves the state of the project when it is loaded up by a real save when the project is saved.) In fact if you go into the project folder or whatever folder it is in Sonar, then you can delete the autosaves with no problem because maintainence is needed on a computer anyway.
Better to defrag the harddrive and check it out for bad sectors especially the defrag than worry about an autosave file that takes hardily no room at all on the harddrive. A computer needs maintainance and that can not be avoided, but still I do not even use schedules and leave the computer on all the time, I have harddrive partitions meaning that the harddrive is broken up into different drive letters and different partitions depending on how large I think I will ever use the space on the harddrive for anything. I am using 5.37gB of a logical drive that is 159gB total, and of course if I needed more, I could always use another logical drive by saving the project on a different logical drive letter.
That way if the primary partition C:\ drive bombs because the OS is on that and is the drive used most often starting up the computer and loading the OS, then all I have to replace when the new harddrive is put in is the C:\ drive reloading the backup that is made of it onto a new harddrive and putting in the old harddrive (the C:\ partition that does not work) as a second harddrive just long enough to copy everything over to the new harddrive, and still have all of it on the old harddrive for projects and other programming things on different partitions I may have, because the C:\ drive is the only bad partition on the old drive, the rest of the data is still okay and can be read at any time, plus copying from harddrive to harddrive is the fastest way to move the data around to use the new harddrive quicker.
Anyone who thinks I am going to use DVD disk to save everything is wrong, even if they are cheap because it would take tons of them and take a long time to do all of that. The boot partition - C:\ drive is the main drive of the computer anyway, and what is needed to store the OS and run the computer to start anyway, and that I usually keep the less programs on, since the OS is about the only thing except for other programs that store a little bit on the C:\ drive also. I have a computer game also there because I did not know at the time how to install it on a different partition say like F:\, G:\, or H:\ which is not as many partitions as I had in the Past. (forgot to put in my second harddrive I bought also and should do that where on a different partition or the second new harddrive I got would be the backup for the computer).
When the C:\ primary partition goes, the rest of the harddrive is still good, just can not start up the computer because the OS is on it. I have an old computer with XP that is going on 7 years old now, and it still is running fine although I should update the anti-virus on it, and turn it on once in awhile. Actually I still like XP better than Windows 7.