In the US, 17 U.S. Code § 117 (a) gives me the right to make a backup of a computer program. An eBook is...probably not a computer program.
But ALSO, it is legal to make backup copies of non-program media so long as you don't circumvent any non-exempted encryption technologies to do so, and so long as you destroy those copies when you no longer have access to the original, and so long as you use the backup for no purpose other than backup, and so long as you don't access anything besides what's necessary to make a copy. The big problem is the "non-exempted encryption" because nothing's exempt by default, and exemptions given out by the Library of Congress only last for a few years.
In the US, 17 U.S. Code § 117 (a) gives me the right to make a backup of a computer program. An eBook is...probably not a computer program.
But ALSO, it is legal to make backup copies of non-program media so long as you don't circumvent any non-exempted encryption technologies to do so, and so long as you destroy those copies when you no longer have access to the original, and so long as you use the backup for no purpose other than backup, and so long as you don't access anything besides what's necessary to make a copy. The big problem is the "non-exempted encryption" because nothing's exempt by default, and exemptions given out by the Library of Congress only last for a few years.
Not sure what the rule is in Canada.