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If you want to collect your sets into a list, you can start with the empty list, and append your sets to that list:
sage: L = []
sage: L.append({1,2,3})
sage: L.append({12,13})
sage: L
[{1, 2, 3}, {12, 13}]
At the end of the day, you can save that list on your disk:
sage: save(L,'/path/to/my_list.sobj')
The other day, you can load that list again:
sage: L = load('/path/to/my_list.sobj')
sage: L
[{1, 2, 3}, {12, 13}]
Then continue to append sets into it:
sage: L.append({123})
sage: L
[{1, 2, 3}, {12, 13}, {123}]
Then sage it again (on the same or a different file if you want to keep the history):
sage: save(L,'/path/to/my_list.sobj')
And so on.
